<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img
          src="../assets/logo.png"
          alt=""
        >
      </div>
      <!-- 登录表单 -->
      <el-form
        class="login_form"
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
      >
        <!-- 用户名 -->
        <el-form-item
          prop="username"
        >
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            type="password"
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
          ></el-input>
        </el-form-item>
        <!-- 按钮区 -->
        <el-form-item class="btns">
          <el-button
            type="primary"
            @click="login"
          >登录</el-button>
          <el-button
            type="info"
            @click="resetLoginForm"
          >重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //登录表单的数据绑定对象
      loginForm: {
        username: "admin",
        password: "123456",
      },
      //表单验证规则对象
      loginFormRules: {
        //验证用户名是否正确
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10 个字符",
            trigger: "blur",
          },
        ],
        password: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 6,
            max: 16,
            message: "长度在 6 到 16 个字符",
            trigger: "blur",
          },
        ],
      },
    };
  },
  methods: {
    resetLoginForm() {
      // console.log(this.$refs.loginFormRef);
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      // console.log(this.$refs.loginFormRef);
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return;
        // console.log(this.$http);
        const {data} = await this.$http.post('/login', this.loginForm);
        if (data.meta.status !== 200) return this.$message.error('登录失败');
        this.$message.success('登录成功');
        //1. 将登录成功之后token，保存到客户端的sessionStorage中
        //  1.1 除了登录的api，必须登录之后才能访问
        //  1.2 token只应当前网站打开生效，token 保存在 sessionStorage
        //sessionStorage会话期间存储
        window.sessionStorage.setItem('token', data.data.token);
        //2. 通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home');
      });
    },
  },
};
</script>

<style lang="stylus" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
  }

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 5px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;

    img {
      width: 100%;
      height: auto;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>